Ios 将Firebase数据从主视图控制器发送到详细视图控制器
我可以创建一个类似Instagram的UICollection视图提要，但我不知道如何选择单元格并转到更详细的视图控制器。以下是我的主视图控制器的外观。”Ios 将Firebase数据从主视图控制器发送到详细视图控制器,ios,swift,firebase,firebase-realtime-database,uicollectionviewcell,Ios,Swift,Firebase,Firebase Realtime Database,Uicollectionviewcell,我可以创建一个类似Instagram的UICollection视图提要，但我不知道如何选择单元格并转到更详细的视图控制器。以下是我的主视图控制器的外观。” func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { performSegue(withIdentifier: "details", sender: self) } override
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
performSegue(withIdentifier: "details", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "details" {
if let indexPaths = self.collectionView!.indexPathsForSelectedItems{
let vc = segue.destination as! MainViewController
let indexPath = indexPaths[0] as NSIndexPath
let post = self.posts[indexPath.row] as! [String: AnyObject]
let Booked = post["title"] as? String
let Authors = post["Author"] as? String
let ISBNS = post["ISBN"] as? String
let Prices = post["Price"] as? String
let imageNames = post["image"] as? String
vc.Booked = Booked
vc.Authors = Authors
vc.ISBNS = ISBNS
vc.Prices = Prices
vc.imageNames = imageNames
print(indexPath.row)
} }}
//Detailed View Controller
FIRDatabase.database().reference().child("posts").child(self.loggedInUser!.uid).observeSingleEvent(of: .value, with: { (snapshot:FIRDataSnapshot) in
if let dictionary = snapshot .value as? [String: AnyObject] {
self.BookTitle.text = dictionary["title"] as? String
self.Author.text = dictionary["Author"] as? String
self.ISBN.text = dictionary["ISBN"] as? String
self.Price.text = dictionary["Price"] as? String
self.Image.image = ["image"] as? UIImage
}
})
上面是我的详细视图控制器。但是，当我单击单元格时，我的信息不会被传递，这似乎是重复的。在这里可以找到在视图控制器之间传递数据的一个很好的示例：
结构化数据也很重要。如果从Firebase数据库接收到
PostUICollectionViewCellPostfunc collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
// No Need to call this performSegue(withIdentifier: "details", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "details" {
if let indexPaths = self.collectionView!.indexPathsForSelectedItems{
let vc = segue.destination as! MainViewController
let cell = sender as UICollectionViewCell
let indexPath = self.collectionView!.indexPathForCell(cell)
let post = self.posts[indexPath.row] as! [String: AnyObject]
let Booked = post["title"] as? String
let Authors = post["Author"] as? String
let ISBNS = post["ISBN"] as? String
let Prices = post["Price"] as? String
let imageNames = post["image"] as? String
vc.Booked = Booked
vc.Authors = Authors
vc.ISBNS = ISBNS
vc.Prices = Prices
vc.imageNames = imageNames
print(indexPath.row)
} }}
在viewDidLoad中编写代码 嗨。请将代码段以文本形式发布，并相应格式化，而不是发布屏幕截图。@AL.我已将代码段以文本形式发布。您应该在主ViewController中解析firebase中的数据，并将其传递给detailViewController。您的代码仅显示您在detailViewController中解析firebase中的数据。换句话说，你没有任何东西可以传递给你的DetailViewController你是一个了不起的救生员！非常感谢你！你不知道你帮了我多少忙！非常感谢你事实上，我很抱歉我还有一个问题。让imageNames=post[“image”]作为？字符串实际上应该从firebase检索一个图像，但它没有。我不认为我应该把它声明为字符串。我该怎么办？我猜你们的图像一定在存储器中，在firebase数据库中你们只存储了你们的名字。因此，使用该名称从存储器下载该图像。像storageRef.child（'images/stars.jpg'）.getDownloadURL（）。然后（函数（url）{//您在这里有下载url，所以下载并缓存它，所以您不需要下次每次都下载。）我再次道歉，感谢您的耐心。我以为它管用，但我想它没用。我在下面的回答中发布了我的更新代码。我做错了什么？不要在mainviewcontroller中下载图像。详细下载iewcontroller。Anfd在闭包中指定图像对象，不要在外面。如果{}要详细说明，请将整个图像对象从Herdo中删除。您介意的话，请给我看一下。我仍然不断出错，我已经更新了我的答案。更改了详细信息查看控制器。谢谢你，你刚刚救了我几天的心痛
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "details" {
if let indexPaths = self.collectionView!.indexPathsForSelectedItems{
let vc = segue.destination as! MainViewController
let cell = sender as! UICollectionViewCell
let indexPath = self.collectionView!.indexPath(for: cell)
let post = self.posts[(indexPath?.row)!] as! [String: AnyObject]
let Booked = post["title"] as? String
let Authors = post["Author"] as? String
let ISBNS = post["ISBN"] as? String
let Prices = post["Price"] as? String
if let imageNames = post["image"] as? String {
let imageRef = storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
let image = UIImage(data: data!)
}else {
print("Error downloading image:" )
}
vc.Booked = Booked
vc.Authors = Authors
vc.ISBNS = ISBNS
vc.Prices = Prices
vc.imageNames = imageNames
print(indexPath?.row)
})} } }}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "details" {
if let indexPaths = self.collectionView!.indexPathsForSelectedItems{
let vc = segue.destination as! MainViewController
let cell = sender as! UICollectionViewCell
let indexPath = self.collectionView!.indexPath(for: cell)
let post = self.posts[(indexPath?.row)!] as! [String: AnyObject]
let Booked = post["title"] as? String
let Authors = post["Author"] as? String
let ISBNS = post["ISBN"] as? String
let Prices = post["Price"] as? String
if let imageNames = post["image"] as? String {
let imageRef = storage.reference(forURL: "gs://gsignme-14416.appspot.com/images/")
imageRef.data(withMaxSize: 25 * 1024 * 1024, completion: { (data, error) -> Void in
if error == nil {
let image = UIImage(data: data!)
}else {
print("Error downloading image:" )
}
vc.Booked = Booked
vc.Authors = Authors
vc.ISBNS = ISBNS
vc.Prices = Prices
vc.imageNames = imageNames
print(indexPath?.row)
})} } }}